added Kamaln7 ansible swapfile role

roles/swapfile/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014 Kamal Nasser <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

roles/swapfile/README.md

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+ansible-swapfile
+================
+
+This role configures a swapfile (/swapfile) with the (default) size of 512MB.
+
+## Dependencies
+
+None.
+
+## Variables
+
+* `swapfile_use_dd` [default: `False`]: if set to False, `fallocate` is used to create the swapfile, otherwise, `dd` is used. You may need to set this to True if your filesystem does not support `fallocate` -- see Issue #3.
+
+* `swapfile_size` [default: `512MB`]: the size of the swapfile to create in the format that `fallocate` expects:
+
+    The  length and offset arguments may be followed by binary (2^N) suffixes KiB, MiB, GiB, TiB, PiB and EiB (the "iB" is optional, e.g. "K" has the same meaning as "KiB") or decimal (10^N) suffixes KB, MB, GB, PB and EB.
+
+    If `swapfile_use_dd` is set to True, `swapfile_size` must be set to the amount of megabytes to write, e.g. `512`.
+
+* `swapfile_location` [default: `/swapfile`]: the location of where the swapfile will be created
+
+### Optional
+
+The following variables are set to `False` by default and will not have any effect on your hosts. Setting them to any value other than `False` will update your hosts' sysctl.conf file.
+
+* `swapfile_swappiness` [default: `False`]: the swappiness percentage (vm.swappiness) -- the lower it is, the less your system swaps memory pages
+
+* `swapfile_vfs_cache_pressure` [default: `False`]: "this percentage value controls the tendency of the kernel to reclaim the memory which is used for caching of directory and inode objects."
+
+## Usage
+
+```yaml
+- hosts: all
+  roles:
+    - kamaln7.swapfile
+```
+
+or:
+
+```yaml
+- hosts: all
+  roles:
+    - { role: kamaln7.swapfile, swapfile_size: 1GB, swapfile_swappiness: 10, swapfile_location: /mnt/swapfile }
+```
+
+You can also set the variables described above in `group_vars` or `host_vars` (see `defaults/main.yml`).
+
+## License
+
+The MIT License (MIT)
+
+Copyright (c) 2014 Kamal Nasser <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

roles/swapfile/defaults/main.yml

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+---
+swapfile_location: /swapfile
+swapfile_size: 512MB
+swapfile_swappiness: False
+swapfile_vfs_cache_pressure: False
+swapfile_use_dd: False

roles/swapfile/handlers/main.yml

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+---
+- name: Reload sysctl
+  command: sysctl -p

roles/swapfile/meta/main.yml

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+---
+galaxy_info:
+  author: "Kamal Nasser"
+  description: swapfile
+  license: MIT
+  min_ansible_version: 1.4
+  version: 0.4
+  categories:
+    - system
+  dependencies: []

roles/swapfile/tasks/main.yml

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+---
+- name: Write swapfile
+  command: |
+    {% if swapfile_use_dd %}
+    dd if=/dev/zero of={{ swapfile_location }} bs=1M count={{ swapfile_size }} creates={{ swapfile_location }}
+    {% else %}
+    fallocate -l {{ swapfile_size }} {{ swapfile_location }} creates={{ swapfile_location }}
+    {% endif %}
+  register: write_swapfile
+  when: swapfile_size != false
+
+- name: Set swapfile permissions
+  file: path={{ swapfile_location }} mode=600
+  when: swapfile_size != false
+
+- name: Create swapfile
+  command: mkswap {{ swapfile_location }}
+  environment:
+    PATH: "{{ (ansible_env|default({})).PATH|default('') }}:/usr/local/sbin:/usr/sbin:/sbin"
+  register: create_swapfile
+  when: swapfile_size != false and write_swapfile.changed
+
+- name: Enable swapfile
+  command: swapon {{ swapfile_location }}
+  environment:
+    PATH: "{{ (ansible_env|default({})).PATH|default('') }}:/usr/local/sbin:/usr/sbin:/sbin"
+  when: swapfile_size != false and create_swapfile.changed
+
+- name: Add swapfile to /etc/fstab
+  lineinfile: dest=/etc/fstab line="{{ swapfile_location }}   none    swap    sw    0   0" state=present
+  when: swapfile_size != false
+
+- name: Configure vm.swappiness
+  lineinfile: dest=/etc/sysctl.conf line="vm.swappiness = {{ swapfile_swappiness }}" regexp="^vm.swappiness[\s]?=" state=present
+  notify: Reload sysctl
+  when: swapfile_swappiness != false
+
+- name: Configure vm.vfs_cache_pressure
+  lineinfile: dest=/etc/sysctl.conf line="vm.vfs_cache_pressure = {{ swapfile_vfs_cache_pressure }}" regexp="^vm.vfs_cache_pressure[\s]?=" state=present
+  notify: Reload sysctl
+  when: swapfile_vfs_cache_pressure != false